Reaction of spin-correlated ortho-positronium and radical in room temperature ionic liquids

Hirade, Tetsuya  

-positronium (-Ps) has the longest positron annihilation lifetime in the insulators. This lifetime becomes shorter at higher temperatures in room temperature ionic liquids (RTIL). This phenomenon is different from many other liquids. Only water showed the same tendency, suggesting the -Ps reaction as in water. Therefore, quantum beats were expected and observed in RTIL as well as in water. Quantum beats are the result of a reaction with the spin-correlated radical, indicating that the formed radical can be probed by the quantum beats.